Production of vat dyestuffs



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Patented Jan. 19, 1932 UNIT D- STATES PATENT I OFFICE MAX ernnnr'xunz, or MeNNH IM, AND mnn KQBERLE, or nunwresnnrnN-oN-rnn- "iaHINn'eERMAnY; Assreno'ris' TO ennnn nnienrnii rn worms, me, or new YORK,

N. Y.', A oaromrit v or nntewenn w n 9 VAT" ressers 1T0 Drawing. Application fi1ed-Ju1y28, 1928, Serial No. 296,086, and in Germany July 21, 1926.

he Pr nt appl c t n s a o tinuat on n p r at o r ope d g. appli t n f r ma u a ured a yes uf s S r- Ne 9 420, filed June 16, 1927, and relates to the pr du ien o et yest whic a e on.- red o b snth adi nthrpneslVe have found that new and particularly valuable vat dyestuffs are obtained by treats" al rm rnaphthedi hth ehe whi m y h hh h d y si is t ng a Z methY -me h z aht m to hich a agent w th n a kali e ac -i n, wit c n ing en s u as a d F Bh h esQQtS, fQP 1 H h h m hle ii nd .the l k 9 with 9 kal h e t ch a c ust o ash, un er energeticconditions, such as high tempera tures, with, if desired, an addition of an oxidizing agent, with orwithout the presence of solvents; It is probable that by the said treatment condensation elfected ad- ;ditionaliing formation according to the female i The newprod'ucts may be termed msia'nf Plainthe nature of the invention which howthradianthrones. They" generally dissolve inconcentrated. sulfuric acid to a violet to bluesolution, and the bluislrviolent yats give i s 1 w r at imila s ad whi h, when washed and soaped, change to a golden yellow extremely fast to light. a r dchl-orine.

The condensation with alkaline agents as referred to above has the special advantage that there is no need forthe allo-ms-naphthodianthroneto be firstprepared as such, but that the preparation of the allo-ms-napht-hodianthrone from 2.2-dimethyl-ms-benzdianthrone, as described in our copending application Ser. No. 199,420, can be combined with th at not the ms authradianthrones, whereby the ms-anthradianthrones can be prepared direct, in one operation, from 2.2-dimethyl-ms-benzdianthrone, by treatment with alkaline agents, a suitable method being by fusion with caustic alkalis. F or example, 2.2 -dimethyl m s-benzdianthrone is first treated with alcoholic caustic potash, under the conditions specified in Example 2 ofthe said application Ser. No. 199,420, the reaction temperature beingraised to from about 250 to 280 C. after the alcohlolhas been distilled oli. The '2'rdim hy -msehz o es m y a so be subjected directly to energetic treatment with alkaline agents, for example at from 250 to 280 C. thereby obtaining ms-anthradianthrones direct. The Vat dyestufi. 'obtained from the 2.2-dimethyl-mssbenzdiam throne in both cases corresponds in its prop erties to the ins-anthradianthrone obtained by treating 'allo-ms-naphthodianthrone with acid condensingagentsfvery good yields are obtained withthe present process. Halogenated ms-anthradianthrones are obtained by condensinghalogenated allo-ms- V naphthodianthrones which may be produced according to our copending application'sm. No. 296,085 in the before-described manner, or by subjecting an allo-ms-naphthodianthrone to treatment with halogen and simultaneous condensation, for example to treatment with halogen under pressure whereby hall0genation and condensation are effected simultaneously. The following examples will further exfiyer is not restricted to these examples. The parts are by weight. i

Emma

powden which may be crystallized in small brown needles from nitrobenzene. The color of the solution in concentrated sulfuric acid is violet. Strong golden-yellow dyeings are obtained on cotton from a blue violet vat.

Example 2 1 art of the initial substance referred to in. xample 1 is dissolved in 25 parts of trichlorbenzene and 10 parts of powdered aluminium chlorid are stirred in at from 140 to 145 C. After stirring for about 1 hours, ice and dilute hydrochloric acid are added, and the solvent is expelled with steam. The resulting product is identical with the prodnot obtained in Example 1.

Example 3 A imixture of 1 part of dibrom-allo-msnaphthodianthrone and 10 parts of aluminium chlorid is heated to form 160 to 165 C. until the color of the solution of a sample of the reaction product in concentrated su furic acid has become blue, which will occur in about 1% to 2 hours. Dilute h drohloric acid is then added, and the dyestu is filtered by suction. According to analysis, the re sulting brown powder is a dibrom-msanthradianthrone; it can be purified by treatment with hy ochlorite or by crystallization from nitro nzene. It furnishes strong orange-red dyeings on cotton from a bluishviolet vat.

.- Example5 1 part of allo-ms-naphthodianthrone is heated with 3 parts of bromine to 100 C. for about 12 hours under pressure. The reaction duct is dissolved in dilute caustic soda solution and filtered by suction. It consists of a brown powder, which dissolves to a eenish blue solution in concentrated suluric acid, and gives strong orange-red dyeings on cotton from a bluish-violet vat.

Example 6' 10 rts of allo-ms-naphthodianthrone are disso ved in 100 parts of chlorsulfonic acid, whereupon 3 parts of sulfur are added while stirring, followed by 4 parts of bromine. The mass is thenheated to 65 to 70 C. and stirred at this temperature for 4 hours, whereupon it is diluted with parts of concentrated The resultin dibrom-ms-anthradianthrone is filtered o by suction. It dissolves with a blue coloration in concentrated sulfuric acid and dyes cotton from a bluish-violet vat orange shades of excellent fastcness.

Example 7 10 arts of sulfuryl chlorid are stirred, drop y drop, at about G. into a solution of 10 parts of allo-ms-napthodianthrone in 100 parts of nitrobenzene, 0.5 part of iodine having been previously added. Stirrin is continued, at the same temperature, for %urther 6 hours," after which the temperature is raised to 160 C. and 0.5 part of iron filings or powder is added, followed by 10 parts of bromine. As soon as the evolution of halogen hydride has ceased, the treatment is continued as in the foregoing example, and the reaction product behaves in the same manner as that obtained in the said example.

Example 8 400 parts of allo-ms-naphthodianthrone are stirred into 2000 parts of caustic potash at from 220 to 225 C. The temperature is then raised to from 270 to 280 (1., and stirring is continued until a sample of the reaction mixture dissolves to a blue-violet color in concentrated sulfuric acid, which occurs at the end of several hours. The melt is then cooled and taken up with hot water, the resulting) dyestufi being completely thrown down y boiling or by an air blast, and then filtered b suction, washed until neutral and dried. he dyestufi, which represents an excellent yield and is in a very pure state, dissolves to a violet solution in concentrated sulfuric acid, 'ves strong golden yellow dyeings on cotton rom a blue-violet vat, and can obtained in the form of small brownish yellow acicular crystals from solvents of hi h boiling point, such as nitrobenzene. ts properties therefore agree with the msanthradianthrone obtained according to Example 1.

Example .9

400 parts of 2.2-dimeth l-ms-benzdianthrone are stirred into a me t of 2000 parts of caustic potash and 2000 parts of alcohol, at from 115 to 120 C. The term rature is then raised to from 140 to 145 and stirring is continued at that temperature for several hours. After distilling off the alcohol, the temperature is raised to 280 C. and is maintained at that level until a sample of the reaction product gives a blue violet solution inconcentrated sulfuric acid. The melt is then allowed to cool down a little and, after being taken up with hot water, is treated as described in the fore oing example. The resulting dyestuif is id entical with that obtained according to Example 1. It can also ans sulfuric and Poured Onto be obtained by treating 2.2'-dimethyl-ms- 1 v henzdianthrone direct with an alkali melt at 280 C.

l/Vha-t we claim is:

1. As new articles of manufacture, vat dyestuffs which are considered to be halogenated ms-anthradianthrones forming violet vats and dissolving to blue solutions in concentrated sulfuric acid. a

2. As new articles of manufacture dibromms-anthradianthi'one forming a bluish-violet vat and dissolving to blue solutions in concentrated sulfuric acid.

8. The process of producing new vat dyestuffs which comprises sub ecting an allo-msnaphthodianthrone to the action of a con (lensing agent. i

4. The process of producing new vat dyestuffs which comprises SllbJGCtlIlg an allo-msnap thodianthrone to the action of an acid.

condensing agent.

5. The process of producing new vat dyestuffs which comprises subjecting an allo-msnaphthodianthrone to halogenation and simultaneous condensation. V

In testimony whereof, we affix our signatures.

MAX ALBERT KUNZ. KARL KoBERLE. 

